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Research on Adaptive Variable Structure Control for Gauge Control System of Cold-Strip Rolling Mill

Author: JieYunPeng
Tutor: FangYiMing
School: Yanshan University
Course: Control Theory and Control Engineering
Keywords: AGC Delay systems Adaptive control Sliding Mode Control Enter the dead zone Input constraints Reaching Law
CLC: TP273
Type: Master's thesis
Year: 2011
Downloads: 46
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Abstract


Cold strip mill hydraulic AGC (automatic gauge control) system with nonlinear , time-varying , uncertainties and other characteristics . Using the traditional PID control method has mature technology , easy to operate and so on . Actual hydraulic AGC system load , oil temperature and interference , and the incoming thickness , hardness fluctuations , and the mill 's mechanical systems , control system parameters change , was charged with the object model parameters will change . In recent years, with the continuous development of the control theory for the plant model parameter uncertainty appeared in many advanced control theory , and has already been applied in the actual project . Firstly, according to the mill hydraulic servo system works to establish a mathematical model of the location system . Mill thickness detection system contains lags derived a mathematical model of the entire thickness of the control system . Secondly, for the thickness of the control system , the control input containing dead zone delay systems adaptive variable structure controller design . Appropriate linear transformation model , containing part of the amount of control and without control part of phase separation , and to construct Lyapunov function and linear matrix inequality coefficient of sliding surface . For the the input containing dead zone characteristics adaptively estimated by the slope of the dead zone to reduce the adverse effects of the characteristics of the dead zone of the system performance . Then , for the mill hydraulic servo system control input saturation problem , in the case of bounded external disturbances to design adaptive variable structure antisaturation controller , system control input saturation limit adaptive parameter estimation , making the design of the controller output has not reached the saturation control output , while the output of the control quantity decreases when saturated in this way the control output to be optimized . And by proper selection of the Lyapunov function to prove the stability of the system . Finally, the design of variable structure controller for discrete mathematical model . Given an improved basis for reaching law of parameters selected on the basis of the original variable structure reaching law . In Design controller at the same time to ensure that the switching amplitude of the control amount can be limited within a certain allowable range .

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system
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